Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1986-05-23
1988-06-07
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5744, B25B 1346
Patent
active
047488735
ABSTRACT:
A low profile power wrench is provided which is useful both for general application and for easy accesses to bolts and nuts in cramped or hard to reach places. The drive of the wrench and the reaction system are in tension, thereby resulting in important advantages for the wrench. The wrench includes a power cylinder having a piston rod extending therethrough. An anchor or reaction assembly comprising an anchoring ring and attached anchor rod is adjustably (i.e., threadably) attached to the piston rod to permit connection of the anchoring ring to a nut spaced from the nut to be turned. A wrench assembly comprising a preferably arcuate lever arm with a ratchet assembly is pivotably connected to the power cylinder. Operating fluid (hydraulic or pneumatic) is delivered sequentially to the power cylinder through first and second inlet/outlet openings. The piston rod carries a piston which separates the cylinder into a pair of chambers such that during a power stroke, the fluid will exert a load on one side of the piston or the other to cause the power cylinder (not the piston rod) to move in a linear direction. The moving cylinder will, in turn, urge the wrench assembly lever arm in a arching direction whereby the ratchet assembly turns a nut or bolt. During a return stroke, the fluid will exert pressure on the opposite side of the piston to return the wrench assembly to its original position. Adjustment means are provided which limit the angle between the lever of the ratchet assembly and the piston rod in order to maintain that angle constant at the beginning of each forward (power) stroke.
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Maschinerrfabrik, P. H. Wagner, "Hydro-Plarad-R+K".
Rachuba Maurina
Raymond Engineering Inc.
Schmidt Frederick R.
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